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Smithsonian National Museum of Natural History


No description of this
                                          asset is available
Photo by Ken Larsen. Click to zoom.
Catalog Number NMNH G10628-00
Locality Minas Gerais, Brazil
Weight 3.2 ct

Gift of Ms. Luciana Barbosa in 2009.

It is common to find inclusions in quartz crystals. Quartz is usually one of the last minerals to form in a deposit, so it sometimes grows around existing crystals. Because quartz is commonly clear, the inclusions are easy to see. This emerald–cut quartz from Brazil has a blue anatase crystal inclusion as well as needle-like inclusions of rutile. In this specimen, we can see the anatase inclusion seemingly floating in this clear quartz gem. Anatase is a form of titanium dioxide and is usually found as small, isolated, well-developed crystals. This 3.2ct gem is the first quartz gemstone with an anatase inclusion in the National Gem Collection.


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